When unadapted to ketosis the body can excrete up to 100 kcal of ketones: As a side note, urinary and breath excretion of acetone is negligible in terms of caloric loss, amounting to a maximum of 100 calories per day (2).
Mate selection may also be a factor associated with bilateral symmetry in humans. A December 2005 article by health and environmental reporting expert, Ker Than, reports on an experiment that indicated women are more attracted to men that have more symmetrical features.
Quick Answer. Symmetry in nature is the balanced distribution of complementary parts of the natural world. This balanced distribution is exemplified in the bilateral symmetry of most vertebrae, whose left and right sides are mirror images of one another.